Troubleshooting

Table 67
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Check the fuses.
B. Thoroughly inspect the battery connections and the con-
nections to the relays. Refer to Troubleshooting, “Electrical
Connector - Inspect” for details.
C. Perform a 30 N (6.7 lb) pull test on each of the wires in the
ECM connector that are associated with electrical power sup-
ply circuit.
D. Check the harness for abrasion and for pinch points from
the battery to the ECM.
Damaged wire
or connector
Result: A damaged wire or damaged connector was found. A
fuse is blown.
Repair: Repair the damaged wire or the damaged connector.
Replace any blown fuses
Use the electronic service tool to clear all logged diagnostic co-
des. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly con-
nected and/or inserted and the harness is free of corrosion, of
abrasion or of pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes or Logged Diag-
nostic Codes
A. Connect the electronic service tool to the diagnostic
connector.
B. Turn the keyswitch to the ON position and start the engine.
C. Monitor the active diagnostic code screen on the electronic
service tool. Check and record any active diagnostic codes or
logged diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic co-
des to become active.
Diagnostic
codes
Result: There are no active 168 diagnostic codes at this time.
Repair: If the fault is intermittent, refer to Troubleshooting,
“Electrical Connector - Inspect”.
If the ECM is receiving no battery voltage, proceed to Test Step
3.
Result: There is an active 168-3 diagnostic code.
Proceed to Test Step 3.
Result: There is an active 168-4 diagnostic code.
Proceed to Test Step 4.
3. Check the Alternator
A. Test the alternator for correct operation. Refer to Systems
Operation, Testing and Adjusting, “Alternator - Test”.
Alternator Result: The alternator is faulty.
Repair: Replace the alternator.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: The alternator is operating correctly.
Proceed to Test Step 4.
4. Check the Battery
A. Load-test the battery. Use a suitable battery load tester.
Refer to Systems Operation, Testing and Adjusting, “Battery -
Test” for the correct procedure.
Battery load
test passed
Result: The battery does not pass the load test. The meas-
ured voltage is less than 11 VDC.
Repair: Recharge or replace the faulty battery.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The battery passes the load test. The measured volt-
age is at least 11 V.
Repair: Check the wiring between the battery and the ECM.
Refer to the Electrical Schematic for the application. Make any
necessary repairs.
If the fault is still present, contact the Dealer Solution Network
(DSN).
UENR0612-07 133
Circuit Tests
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